50-1R short pitch roller chain: 1) Material: 40 Mn 2) Standard: ANSI, ISO, DIN 3) Color: natural, blue, yellow, black 50-1 short pitch roller chain's specification:1) Material: 40 Mn2) Standard: ANSI, ISO, DIN3) Color: natural, blue, yellow, black4) Packing: a chain + a polybag + individual box + wooden case ( customer's new own brand is availale) 50-1R roller chain